Wrong about the oils used to make soap causing dingyness the pure oils tend to wash right out. Dingyness is caused by soap scum, The complex made up of soap and the Hardness minerals in the water. Right on the bluing but mostly they have been replaced with optical brighteners which absorb light at one wavelength [color] and emit it at otherr wavelengths. These are not optical illustions as they can be seen using a spectrophotometer.~gdBlueMountain said:Just a suggestion to those having issues with whites being dingy -- one word -- bluing. Aunt Lydia's Liquid Bluing is what I use I get it at the grocery store in the laundry section. Add a bit to the load when doing whites, follow the instructions on the bottle. Bluing is one of the ingredients in commerical soaps and is what gives them the ability to make whites look so good. Our 19th Century predecessors (and my grandma whom I learned this trick from) rountinly used bluing in laundry back in the day. The soaps and such used for ingredients in the homemade detergents are what cause the fabric to get dingy and yellowed to begin with (the fats used in the soap production specifically), the bluing provides an optical illusion that the human eye translates as whiteness. Hope this helps.